Producers for the hit ABC sci-fi drama went overboard shooting scenes for the finale, requiring them to ask for an extra half-hour of show time — on top of their originally scheduled two-hour finale.

ABC, of course, agreed.

The super-sized two and a half-hour-finale will now air on May 23 from 9 to 11:30 p.m., pushing back local newscasts. Then, at 12:05 a.m., there will be a “Jimmy Kimmel Live: Aloha to Lost” special post-finale show, during which the series’ alternative endings will be revealed.

All of this follows the two-hour series retrospective, “Lost: The Final Journey,” which begins at 7 p.m.

True fans may want to block out the entire weekend for their favorite show though. The network is rerunning the two-hour pilot episode that began the time-traveling mystery May 22 at 8 p.m. This time, the debut episode will be “enhanced” with pop-ups.

Series co-creator Damon Lindelof told the Hollywood Reporter that fans will still be left with unanswered questions after the finale.

“We’re going to be as definitive as we can be and say that this is our ending, but there’s no way to end the show where the fans aren’t going to say, ‘What did they mean by this?’ Which is why we’re not going to explain it,” he said.